"And the cam is retarded on the 24v to comply with EPA, hence no CAT. Also helps Dodge by reducing low rpm torque to save the drive line. I have downstairs a stock '99 Dodge build engine and a commercial build '99. The commercial has the same cam part number but is just about one tooth advanced on the cam timing. Commercial has less EPA regulation. My understanding is that the 12v used the same cam timing, but with the increased torque of the 24v the cam was retarded to comply with epa and save the driveline.

California vehicles, gas and diesel, have had retarded cams for many years which is the lower hp on them. Detroit diesels were 5 degrees retarded on the calif build. A 325 hp v6-92 was 305 hp in california."

Posted by HID in another thread




What is everyones take on this, with our 24v's is there a benefit to rolling our cam timing forward 2 teeth if our dodge 24vs are retarded like that? Has anybody tried this, did it work? it just got me to wondering. Just a thought.

Dusty

 

Only problem I forsee is with the injection pump cause if I'm correct, the injection pump controls timing and advancing the cam might throw it all out of whack.

 

I think it might be a good thing for someone who is just running a fueling box. I wonder if there is a difference between the cam timing of the HO vs the SO?

 

I think that the mismatch between camshaft position sensor and crankshaft position sensor would cause a major headache in the ECM.

EDIT: Made a mistake here- at least the manual for the 98.5 24V doesn't list a sensor reading the actual camshaft position. It should be possible to advance it by rotating it some 1-3 teeth. But since the tappets have to be removed and going in through the timing cover looks like much fun I think most people will find it worthwhile to use a better cam than the stocker if they go that far.

AlpineRAM

 

Ok. Who's got a spare 24v laying around that we can toy with? Where's Haulin in Dixie. I'm sure he's got a couple we could toy with.

 

I actually was thinking that if an individual were into the motor to do a little work why couldnt you unbolt the gear rotate the cam and bolt the gear back on, because wouldnt the keyed bolt pattern of the cam allow you to slide the gear back in 1-3 teeth forward of where it started without having to remove the tappets???. Then again i haven't ever looked at the cam gear closely and definately not that way so i don't even remember,

 

The camshaft gear is to be pressed out and heat-shrunk on.

AlpineRAM

 

That sucks. Guess i'll have to start shopping for a cam when i get to bombing.

 

Aren't some gears bolted on and some pressed.

 

I think they are all pressed on, just some have a bolt for extra holding power.

 

All the 12 and 24 valvers press on. Unless you have a marine engine in your truck or a DD cam with the added bolt. The gear only presses on one way. Its keyed.

I would not suggest advancing a cam from a vendor like DD, Piers, etc.

I would not suggest advancing a stock cam either. You will need to lift the tappets up so you might as well just install a performance cam at that point. You will already have the timing cover off too. Cams are a pain to install if you have never done one. After the first few, it goes faster.

Generally:

Advance = more low end power and faster power
Retarded = more top end power, less top end.

Generally.

Don~

 

Some days I feel retarded, reach up and, sure 'nuf, I have less hair on the top end of my head -- thus proving your theory.

brandon.

 

You really ain't right Brandon, but you know that already don't you?

Chris (also not right, and proud of it )

 

The marine camshaft has a different profile than the engine in a dodge truck? The reason not to advance the aftermarket camshaft is it is all ready advanced? Lower egts and quicker spool = advancing the camshaft? I would agree with Don that it is better to get one from a vendor as he or they have allready done there home work and they should get payed for it. I had rather pay for a camshaft if it is the best bang for the buck.
Remember the 460 ford engine, it had retarded cam timing in the crank gear. I have all ways wondered if a quicker rate of valve opening could ground into the camshaft if the lifter base size would allow this to happen jim

 

The marine cam is different. the cam gear has 72 teeth. one tooth = 10 degrees. too much either direction you go with the stock cam profile